Saw-filing machine



UNITED STA TES PATENT OFFICE.

THOS. M. CHAPMAN, OF OLDTOVN, MAINE.

SAW-FILING MACHINE.

Specification of Letters Patent No. 8,330, dated September 2, 1851.

T0 all whom t may concern.'

Be it known that I, TI-Ios. M. CHAPMAN, of Oldtown, in the county of Penobscot and State of Maine, have invented a new and Improved Machine for Filing Saws; and I do hereby declare that the following is a full, clear, and eXact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1, is a front elevation. Fig. 2, is a side elevation. Fig. 3, is a section sh'owing the arm which is connected with the saw handle. Fig. 4, is a section showing a por tion of the back of the machine, the connecting rod and slide.

Similar letters of reference indicate corresponding parts in each of the several figures. Y

The nature of my invention consists in attaching a swinging frame to a horizontal rod having a reciprocating motion, the horizontal rod is so arranged as to turn in the direction of its axis, and the swinging frame has consequent-ly an up and down motion, and being connect-ed to the horizontal rod by joints it also moves backward and forward, the iile is attached to the swinging frame and is so arranged as to turn on its axis, and is adjusted or kept in any desired position by a handle. The saw to be filed is placed between clamps and secured by screws the clamps are moved by means of a rack placed under them in which a pinion works; on the shaft of the pinion is placed a ratchet wheel which is operated by a pawl and lever. By the above arrangement the same motion is given a lile through mechanical means, as is given by hand, and a saw may be filed more expeditiously and evenly than usual.

To enable others skilled in the art to make and use my invent-ion, I will proceed to describe its construction and operation.

A, represents a metallic plate or strip which is attached to a suitable boX or frame B, this plate or strip A, has two projections on its lower part with holes through them, through which the horizontal rod C, works, see Fig. 1.

D, is a button attached by a set screw to the rod C, at about its center, this button fits in a recess in a slide or block E, a connecting rod F, seen more particularly in Fig. 4, is attached tothe slide or block and also to the pulley Gr, now when the pulley G,

is made to revolve it will at once beseen that a reciprocating motion is given t-he rod C, the projections on the plate being the bearings through which the rod works.

H, H, are arms firmly attached to the ends of the rod C, see Fig. l. These arms extend outward from the rod C projecting a little upward as seen in Fig. 2, and have holes through them at their outer ends, these holes form the bearings for a rod I, which works freely in them and may thus be moved forward or backward.

J, J, J, are arms attached firmly to the rod I, at their upper parts, the lower parts of the arms J, J, J, support the ile K, handle L, and square shaft M, the file, handle and shaft all turn on their axis, the apertures in the lower part of the arms J, J, J, being their bearings, the handle L, is prevented from moving when the file is in motion by the arm N, which is attached by a screw or pivot (n) on the lower part of the frame. The upper part of the arm N, has a slot in it which works in a recess on the end of the handle as seen in Fig. 3. The square shaft M, passes through the center of the handle as seen by t-he dotted lines in Fig. l. The point of the file rests in a pivot (o) and the shank sets in the end of the square shaft as seen at (7)).

C, is the saw which is secured between the clamps P, P, by which the thumb screws (Q,) (QQ) the inner clamp P, has a groove or recess cut in it in which the strip R, attached to the frame works see Fig. l, the clamps I?, P, with the saw secured between them move forward on this strip, and are operated in the following manner, a rack S Fig. 2, is attached to the under side of the clamp P, and a pinion T, meshes into it, on the pinion shaft (t) is hung a ratchet wheel (IL) which is moved or turned by means of the pawl (u) attached to the lever (t) now when the lever (o) is depressed the pawl (u) catches into the teeth of the ratchet wheel U, and turns it and also the pinion T, and as the pinion meshes into the rack S, the rack clamps, and saw are moved forward as the pinion is turned.

V, Figs. l and 9., is a lever, the horizontal rod C, passing through its lower end and the rod I2 passing through a point near its center. This lever is for the purpose of depressing the file K, bringing it down between the saw teeth. This will be understood by referringto Fig. 2. lV, is a spiral spring at the end of the box or frame to which a cord is attached and connected with the lever V, this spring is for the purpose of elevating the file K, when the lever V, is freed from the hand.

rl`he rod I, with the arms J, J, J, constitute a swinging frame. Y

The several parts of the machine being now described, I will proceed to show the manner in which it operates. The saw O, is placed between the clamps Pl P, and secured there by the screws (g) (g) the teeth of the saw being above the tops of the clamps as seen in the figures. A reciprocating motion is then given the rod C, by causing the pulley Gr, to rotate either by hand or other power. It will be seen that the swinging frame, file K, and shaft M, also have the same reciprocating motion as the rod C, as they are attached to it. One motion of the file is now clearly seen. The file is brought down edgewise between the saw teeth by depressing the lever V, with the left hand, the rod C, turning in the direction of its axis, and is adjuste'dto suiteither the front or back of a tooth by turning the handle L, with the right hand. It is of course generally known that the front of a Ysaw tooth is Ynearly vertical while the back forms an angle of about 450. The necessity of having the file. turn on its axis so as to accommodate itself to that angle will be obvious, and the swinging frame having a motion toward and from a person (allowing the person to be in front of the machine) greatly assists in the perfect adjustment of the file to the teeth. The handle L, does not move with the swinging frame in its reciprocating motion. It is Secured by the arm N, .the square shaft M, vibrating through the center of the handle. It will be understood that the file is kept in lits proper position while filing the front or back of a tooth by having the right hand placed upon the handle L, the left hand being engaged in holding down the lever V, and thereby keeping the le K, down between the teeth of the saw as the teeth are filed the saw O, is moved forward by depressing the lever ('12,) the pawl (u) catching into the teeth of the ratchet wheel U, and turning the pinion, and consequently moving the rack S, and saw O, forward. YvVhen the saw is moving forward the swinging frame is allowed to raise sufficiently to enable the file to clear the teeth of the saw.

The spaces between the teeth of the saw may be filed so as to be as deep as desired by pressingdown the swinging frame and file by means of the lever V.

Having thus described the nature and operation of my invention, what I claim as new and desire to secure by Letters Patent 1s-' The swinging frame constructed as described and for the purpose specified, viz: by having the arms J ,1J J firmly attached` to a rod I, the ends of the said rod woplv`,V ing freely in holes or bearings in the e1., 10 of the arms H, H, which are att-ached to tlA horizontal rod C, by which arrangement the swinging frame has an up and down motion owing to the rod C, turning in its bearings, also a horizontal reciprocating motion the same as the rod C, and a forward and backward motion, by which with the aid of the le turning on its axis in the frame, the file may be so adjusted asto operate both upon the frontand back of the saw teeth substane 80 tially as set forth.

THOS. M. CHAPMAN.

Witnesses:

A. SANBORN, JOSEPH W. STRANGE. 

